When a power transformer is subjected to a short circuit impact,its winding state will change to a certain extent,which threatens the safe operation of power grid.In order to deal with the problem that single method is not accurate enough to diagnose trans-former winding deformation,with the winding deformation of a 110 kV transformer as an example,the frequency response method and capacitive decomposition method are combined to analyze the deformation of transformer winding.The results show that there is con-cave defect in Phase A medium voltage winding of the transformer,which is consistent with the observation of the hanging hood.This method has certain guiding significance for the diagnosis of transformer winding state.
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